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  • Source Code (3 lines)regarding silicon labs EFM32GG11B420 which is an M4. I have been using RTT for a few weeks now. all of this is new to me. I have read information on NVIC and ETM. RTT works for me with both execution trace and printf using the default examples on STM32F103 and the segger Cortex M4 reference board. silicon labs and ARM seem to imply that only one of either ETM or ITM modes can be active at any given time. this is conflicting information with my excellent experience using segg…